ARMv7: Factor out reusable timer_wait from sunxi/psci_sun7i.S
timer_wait is moved from sunxi/psci_sun7i.S, and it can be converted completely into a reusable armv7 generic timer. LS1021A will use it as well. Signed-off-by: NWang Dongsheng <dongsheng.wang@freescale.com> Reviewed-by: NHans de Goede <hdegoede@redhat.com> Reviewed-by: NYork Sun <yorksun@freescale.com>
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